Chemical Principles in the Laboratory
11th Edition
ISBN: 9781305264434
Author: Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher: Brooks Cole
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Explain the bond formation between NH3 and Ni2+ in terms of Lewis acid-base theory.
when chlorine gas is added to water during the disinfection of drinking water, it hydrolyzes with the water to form HOCL. The disinfection power of the acid HOCL is 88 times better than its conjugate base, OCl-. The pKa for HOCl is 7.5. (a) what percentage of the total disinfection power exists in the acid form at pH of 6?
Compare the pH of propionic acid and nitric acid when they are dissolved in water at a concentration of 20 mM. This should include writing a balanced equation describing the acid-base reactions involved, calculation of the pKa for both, calculation of pH, and calculation of the percent dissociation of both.
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- A 0.200 M solution of diethylamine, a substance used in insecticides and fungicides, is only 3.9% ionized at 25°C. Calculate the pKb of diethylamine and the pKa of its conjugate acid, the diethylammonium ion. Round to two decimal places. pKb = ? pKa = ?arrow_forwardThe chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic solution of luminol is often sprayed onto surfaces that are suspected of containing minute amounts of blood. Luminol has a molecular weight of 177 g/mol The technician must dilute the luminol solution to a concentration of 5.00×10−2 M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00 L of the diluted spray?arrow_forwardI need help with this problem. Compare the pH of propionic acid and nitric acid when they are dissolved in water at a concentration of 20 mM using the "Arrhenius Concept". Include:a balanced equation describing the acid-base reactions involvedThe calculation of the pKa for bothThe calculation of the two pH's (of propionic acid and nitric acid when they are dissolved in water at a concentration of 20 mM)and A calculation of the percent of dissociation of both propionic acid and nitric acid.The gibbs free energy ΔG are listed as the following:Nitric acid: -152 kJ/molPropionic Acid : -291 kJ/molPropionate: -361 kJ/molarrow_forward
- If the pKa of a weak acid HA is 3.84, what is the pkb of its conjugate base A-arrow_forwardExplain the concepts behind active, exchangeable and potential (reserve) acidityarrow_forwardWhen lithium oxide 1Li2O2 is dissolved in water, the solution turns basic from the reaction of the oxide ion 1O2-2 with water. Write the equation for this reaction and identify the conjugate acid–base pairs.arrow_forward
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